Mill-pick jig.



A. MROZINSKI.

MILL PICK JIG. I APPLICATION man Nov. w. 1916. 1,217,808. Patented Feb. 27, 1917.

v ZSHEETS-SHEETI. 3! I 4 3/ as v 9 as I V za zr 5/ a4 /9 h 1 /6 /7 Z ANTON]: MROZINSKI, OF NEW YORK, N. Y.

MILL-PICK are.

Specification of Letters Patent. Patented Feb, 27, 1917.

Application filed November 16, 1916. Serial No. 131,653.

To all whom it may concern:

Be it known that I, ANTON]: MRozINs I, a citizen of the United States, and, a resident of the city of New York, New Brighton, borough of Richmond, in the county of Richmond and vented a new and Improved Mill-Pick Jig, of which the following isa full, clear and exact description.

My invention relates to a contrivance for presenting mill picks at a proper angle to a grindstone and to automatically regulate the amount of grinding of the pick on the stone.

-An object of the invention is to provide a simple and inexpensive contrivance which can be easily adapted to a grindstone, which will require little attention and will permit the grinding of a number of picks at a time.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure l is a section in elevation of a jig for mill picks on line 1-1, of Fig. 2;

Fig. 2 is a horizontal section on line 22, Fig. 1;

Fig. 3 is a transverse vertical section on line 3-3, Fig. 1; I

Fig. 4 is a modified form of a pick holder; and

Fig. 5 is a plan view of the spacer.

Referring to the drawings, bed which carries the grindstone 8; The bed 7 carries the jig frame 9 to one side of the stones aXle 8. The jig frame presents on each side of the grindstone a pair of standards 10 sloping rearwardly from the stone and braced at the top by a head piece 11 which also engages a vertical standard 12 extending from the bed to the head to re inforce theobliqu'e standards 10. The standards 10 have longitudinal slots 13 extending through the major part of the standards length. A bolt 14 is engaged in the slot of each standard for securing to the facing standards of the opposite sides of the frame 9 transverse supporting braces 15; The

State of New York, have inshifter 20 7 is the frame ards 10 of the frame brace 15 joining the middle standards 10 has preferably a lateral flange 16 for the purpose of increasing the supporting surface for a center plate 17 which rests on the braces 15 and 15. The center plate 17 has a series of parallelly disposed slots 18 open at the end remote from the stone and which end constitutes the rear of the center plate.

.The flange 16 of the brace 15 is also slotted in register with the slots 18. The front edge of the center plate is preferably slightly curved.

Each of the slots 18 of the center plate is engaged by a prong 19 of a corresponding disposed below the center plate. The prong is preferably formed atone end of the shifter. The other end of the shifteris bent in the same direction as the prong and constitutes a. hook 21 which can be easily engaged by a finger to ulation of the shifter on the center plate. Each of the shifters has a bolt 22 engaging the corresponding slot 18. The bolt 22 is preferably located on the plate, while the nut of the bolt, which is in the shape of a butterfly nut, is located below the shifter and by it the'shifter may be secured at any desired position of the plate. The bolt in cooperation with the prong 19 prevents the rotation of the shifter on the center plate.

The prong 19 is intended to engage the handle aperture 23 of a pick 24, the bed forming the support for the pick. moving the shifter in the bed the relation of the pick to the grindstone 8 may be varied.

To maintain the ends of the picks to be sharpened against the grindstone plungers 25 are provided. Said plungers are car 'ried by a bracket 26 preferably supported facilitate the manip- By I by the brace 15 adjoining the front stand- 9. The bracket 26 carries the plungers in alinement with the corresponding slots of the center plate. Each plunger is in the shape of a bolt the head of 'which is adapted to engage the endof the pick to be sharpened and which head supports a shouldered sleeve 27 forming a rest or abutment for one end of a spring 28. The other end of the spring abuts against a similar sleeve 29 forming an extension from the head of the bracket 30. The end of the bolt is threaded and carries a pair of spaced nuts 31 and 32. By adjusting the nut 31 on the plunger 25 the projecting length thereof relative to the bracket 26 may be varied, and, consequently, the amount of the pick to be ground.

The bracket 26 carries an auxiliary bracket 33 disposed rearwardly of the main bracket. The head 34 of said auxiliary bracket constitutes a fulcrum for levers 35 the shorter arms of which engage the corresponding plungers 25 between the nuts 31 and 32. By means of said levers the plungers can be raised to clear the space when placing or advancing a pick to engage the stone. To facilitate the placing and removal of the picks a forked spacer 36 is provided which can be moved between the head 30 and the nut 31 when the plunger is raised and therebymaintain the same in raised or in operative is placed or removed.

The slots 13 in the standards 10 allow the adjustment of the center plate relative to the grindstone for the plu'pose of acco1nmodating grindstones of various sizes and for the purpose of compensating for the wear of the grindstone.

In cases where the picks to be sharpened are eyeless, the pick is engaged by sockets 37 which are detachable from a carrier 38 which is connected to the center plate 39 in a manner similar to what has been described in regard to center plate 17 It is selfevident that the center plate may be provided with any desired number of slots to accommodate a corresponding number of picks to be sharpened. The plunger 25 having a predetermined movement toward the grindstone 8 will cause a predeterminec grinding of the pick end engaging the 'grindstone. Therefore the grinding will be automatic and to the desired point. N 0 special combination is necessary as the end of the pick cannot be ground any farther than the distance the grindstone will move up against the grindstone 8. The quantity of grinding can easily be regulated by adjusting the nut 31 on the plunger, as blunt pick ends will require more grinding than others. The device allows of the grinding of a plurality of picks, requires little attention, and permits the placing or removal of any of the picks on the center bed without in any way affecting the others being sharpened.

I claim:

1. In combination,

position while a pick a support for a pick,

. means for adjusting the p1ck longitudinally of the support, a spring-actuated plunger pick to the support, on said plunger for of the plunger toand adjustable means varying the movement ward the support.

2. In combination, a slidable slotted support for picks, means for adjusting the picks on the support in engagement with the slot of the support, a spring-actuated plunger for moving the picks toward the support, and adjustable means on the plunger for varying the movement of the plunger toward the support.

3. In combination, a slotted support for picks, a shifter associated with the slots of the support for engaging the picks and adjusting the same on the support, a springactuated plunger for engaging the picks and moving the picks toward the support and adjustable means on said plunger for varying the movement of the plunger toward the support.

1-. In combination, a slotted support for picks, means for adjusting the support, a shifter associated with the slot of the support and adapted to engage a pick carried by the support for adjusting the pick on the support, a spring-actuated plunger carried by the support for engaging the pick thereon, and. adjustable means on said plungerfor varying the movement of the plunger toward the support.

5. The combination in a jig adapted to be used with a grindstone of a frame having standards sloping away from the stone and disposed-above the stone, a pick support adjustably mounted in said standards, said support having slots, a shifter associated with each slot of the support for engaging a pick and whereby the pick is adjusted on the support, a spring-actuated plunger carried by the support for engaging a pick thereon, adjustable means on said plunger for varying the movement of the plunger toward the support, and a lever associated with the plunger for raising the same to admit or remove a pick from the support.

6. The combination in a jig adapted to be used with a grindstone of a frame presenting standards sloping away from the stone and rising above the same, a slotted support adjustably carried by said standards, a shifter engaging engaging a pick carried by the support, a bracket rising from the support, a spring actuated plunger carried by the bracket, said plunger being adapted to engage a pick on the support, a lever on the bracket engaging the plunger for relieving pressure from the pick when removing or placing the pick on the support, and a threaded member associated with the spring-actuated plunger and the bracket for varying the movement of the plunger toward the support.

7. The combination in a jig adapted to be used with a grindstone of a frame presenting standards rising above the stone and sloping away from the stone, a slotted support adjustably secured to said standards, a shifter associated with each slot of the support for engaging a pick, means for adjusting the shifter in the slot whereby the pick is adjusted on the support, a bracket each slot of the support for,

carried by the support, a bolt for each pick amount of grinding of a pick is controlled, to be carried on the support associated With and a lever associated with the bracket and the bracket, said bolt having a pair of engaging the upper of the two nuts for rais- 10 spaced threaded nuts above the bracket, a ing the plunger from a pick, substantially spring associated with each bolt for tending as and for the purpose set forth.

to maintain the lower of thetwo nuts in engagement with the bracket and whereby the ANTONI MROZINSKI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

